Parasolid Reader

The Parasolid reader provides full access to the assembly and B-REP data stored within a Parasolid file. A file does not need to have a particular extension to be read correctly by HOOPS Exchange however the file extensions of Parasolid files that you can expect to be loaded by HOOPS Exchange are:

  • .X_B

  • .X_T

  • .XMT

  • .XMT_TXT

Our readers are updated to the latest released version within 90 days of the release of the authoring software. You can see the exact version supported in the current release here.


The assembly definition within the Parasolid file is supported. Incremental load is not supported by our Parasolid reader.


HOOPS Exchange allows you to query the full topological and geometric model defined in a Parasolid file. HOOPS Exchange provides evaluators which allow you to directly query all the geometry types available in Parasolid. You can additionally ask HOOPS Exchange to approximate any specific geometry and provide it in a standard NURBS form.

The list of surface types available in Parasolid is:

  • Blend surface

  • B-spline surface

  • Cone

  • Cylinder

  • Offset surface

  • Plane

  • Revolution surface

  • Sphere

  • Swept surface

  • Torus

The list of curve types available in Parasolid is:

  • B-spline

  • Circle

  • Ellipse

  • Intersection curve

  • Line

  • UV curve


This visualization data for this format is generated by the HOOPS Exchange tessellation engine.


This concept is not supported by Parasolid.


This concept is not supported by Parasolid.

Format-Specific Notes

Parasolid uses the meter as its default unit. In Exchange, however, the model file created will use millimeters instead of meters and a conversion factor will be applied with the ref A3DTopoContextData::m_dScale “m_dScale” member of ref A3DTopoContextData.